YANGON, Jan 15 (AFP) - A Myanmar junta court has hit ousted civilian leader Aung San Suu Kyi with five new corruption charges related to the alleged hiring and purchase of a helicopter, sources close to the case told AFP.

The Nobel laureate, 76, has been detained since the Feb 1 coup last year which triggered mass protests and a bloody crackdown on dissent with more than 1,400 civilians killed, according to a local monitoring group.

Suu Kyi is facing a raft of criminal and corruption charges - including violating the country's official secrets laws - and if convicted of all of them could face sentences tallying more than 100 years of prison.

The charges were levelled against Suu Kyi on Friday afternoon and related to the hire, maintenance and purchase of a helicopter, the sources said.

Former Myanmar president U Win Myint was also hit with the same charges, they said.

In December, state newspaper Global New Light of Myanmar said the pair would be prosecuted for not following financial regulations and causing a loss to the state over the rent and purchase of a helicopter for former government minister Win Myat Aye.

He rented the helicopter from 2019 to 2021 and used it for only 84.95 hours out of 720 rental hours, the paper said.

He is now in hiding, along with other former lawmakers.

A Myanmar court on Monday convicted Suu Kyi of three criminal charges related to illegally importing and owning walkie talkies and breaking coronavirus rules.

She was sentenced to four years in prison.

In December, she also received a two-year jail sentence for incitement against the military and for other coronavirus violations.

The six years of jail time will likely prevent Suu Kyi from participating in fresh elections that the military junta has vowed to hold by August 2023.

Suu Kyi is expected to remain under house arrest as the other legal cases progress.

Journalists have been barred from attending the special court hearings in Naypyidaw and her lawyers were recently banned from speaking to the media.

The daughter of an independence hero, Aung San Suu Kyi spent nearly two decades enduring long stretches of house arrest under the former military regime.

Her time in office was marred by her government's handling of the Rohingya refugee crisis in which hundreds of thousands escaped to Bangladesh in 2017 as they faced rapes, arson and extrajudicial killings at the hands of the Myanmar military.

Before the coup, Suu Kyi was on the cusp of beginning another five-year term as the country's de facto leader after the National League for Democracy won a landslide in November 2020 polls.